H. K. Nigam, “Degree of convergence of functions using Hausdorff-Matrix operator”, B Soc Paran Mat, 42 (2024), 1
A. V. Chaikovs'kyi, “On Some Conditions for the Second Moduli of Continuity”, Ukr Math J, 74:9 (2023), 1471
Nigam H.K., Mursaleen M., Rani S., “Approximation of Function Using Generalized Zygmund Class”, Adv. Differ. Equ., 2021:1 (2021), 34
Nigam H.K., “On Approximation in Generalized Zygmund Class”, Demonstr. Math., 52:1 (2019)
Bezkryla S.I., Nesterenko O.N., Chaikovs'kyi A.V., “On High Orders Moduli of Continuity Generated By Semigroups of Operators”, Jaen J. Approx., 8:2 (2016), 183–190
Bezkryla S.I., Nesterenko O.N., Chaikovs'kyi A.V., “on the Third Moduli of Continuity”, Ukr. Math. J., 66:10 (2015), 1589–1594